英语翻译on one's lefton one's rightone‘s

在.的左边,在...的右边
one 是代词,代指某人,与someone,somebody类似.
还可以代指物品事件.
eg：Do you have red pens?---yes,I have one.
其中one代指的就是red pen.
on one's left 一般就是 on his left,one加s代表所属格.